Metallurgy One Mark Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 25
    15 x 1 = 15
  1. Bauxite has the composition

    (a)

    Al2O3

    (b)

    Al2O3nH2O

    (c)

    Fe2O3.2H2O

    (d)

    None of these

  2. Which of the metal is extracted by Hall-Heroult process?

    (a)

    Al

    (b)

    Ni

    (c)

    Cu

    (d)

    Zn

  3. Electrochemical process is used to extract

    (a)

    Iron

    (b)

    Lead

    (c)

    Sodium

    (d)

    silver

  4. Zinc is obtained from ZnO by

    (a)

    Carbon reduction

    (b)

    Reduction using silver

    (c)

    Electrochemical process

    (d)

    Acid leaching

  5. Which of the following is used for concentrating ore in metallurgy?

    (a)

    Leaching

    (b)

    Roasting

    (c)

    Froth floatation

    (d)

    Both (a) and (c)

  6. Which of the following is not true with respect to Ellingham diagram?

    (a)

    Free energy changes follow a straight line. Deviation occurs when there is a phase change.

    (b)

    The graph for the formation of CO2 is a straight line almost parallel to free energy axis.

    (c)

    Negative slope of CO shows that it becomes more stable with increase in temperature

    (d)

    Positive slope of metal oxides shows that their stabilities decrease with increase in temperature

  7. Among the following, one does not belong to calcination, Pick the odd one out.

    (a)

    \({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)

    (b)

    \({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)

    (c)

    \(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)

    (d)

    \({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)

  8. Which of the following mineral contains calcium as well as magnesium?

    (a)

    Zinc bien de

    (b)

    Aragonite

    (c)

    Dolomite

    (d)

    Carnalite

  9. Identify the decreasing order of carbon content in different forms of iron

    (a)

    Wrought iron> Pig iron> castiron

    (b)

    Castiron > Pig iron> Wrought iron

    (c)

    Pig iron> Cast iron> Wrought iron

    (d)

    Cast iron> Wrought iron> Pig iron

  10. The process of heating of copper pyrites to remove sulphur is called

    (a)

    froth flotation

    (b)

    roasting

    (c)

    calcination

    (d)

    smelling

  11. Na[Ag(CN)2] is _________.

    (a)

    Sodium aurocyanide

    (b)

    Sodium meta aluminate

    (c)

    Aluminosilicate

    (d)

    Sodium dicyano argentate

  12. Semiconductors are purified by_______method.

    (a)

    Zone refining

    (b)

    Electrolytic refining

    (c)

    Mond's process

    (d)

    Beisemerisation

  13. In the metallurgy of iron) limestone is added to coke. Which acts as a_______

    (a)

    Reducing agent

    (b)

    Oxidising agent

    (c)

    Slag

    (d)

    Flux

  14. A mixture containing sulphides of copper and iron is called______

    (a)

    mineral

    (b)

    ore

    (c)

    matte

    (d)

    matrix

  15. In Hall-Herold process___________act as an, anode.

    (a)

    Carbon blocks

    (b)

    hydrogen

    (c)

    copper rods

    (d)

    Zinc rods

  16. 10 x 1 = 10
  17. Malachite

  18. (1)

    Nickel

  19. Cuprite

  20. (2)

    Cu2O

  21. Azurite

  22. (3)

    CuCO3CU(OH)2

  23. Cerrusite

  24. (4)

    Hematite

  25. Gravity separation

  26. (5)

    Zinc Blende

  27. Froth floatation

  28. (6)

    Angelsite

  29. Sulphate ore

  30. (7)

    Copper

  31. Liquation

  32. (8)

    Tin

  33. Mond's process

  34. (9)

    Pb

  35. Electrolytic refining

  36. (10)

    Cu

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